/**
 * Encode a string to a base64 encoded string.
 * @param str - String to encode.
 * @returns Base64 encoded string.
 */
export declare function encodeBase64(str: string): string;
/**
 * Remove whitespace from the left side of a string.
 * @param string - String to trim.
 * @returns String without whitespace on the left side.
 */
export declare function trimLeft(string: string): string;
/**
 * Remove whitespace from the right side of a string.
 * @param string - String to trim.
 * @returns String without whitespace on the right side.
 */
export declare function trimRight(string: string): string;
/**
 * Remove whitespace from the left and right side of a string.
 * @param string - String to trim.
 * @returns String without outer whitespace.
 */
export declare function trim(string: string): string;
/**
 * Remove file extension from a string, e.g. remove 'test.jpg' would return 'test'.
 * @param fileName - File name to remove the file extension from.
 * @returns File name without extension.
 */
export declare function removeFileExtension(fileName: string): string;